One thing to watch out for with the UIC: It is for a DH-485 interface only. It has a 9 pin D-sub port on the end of it and that sure looks like it will connect to a serial port using DF-1 protocol, but it wont. It is exclusively for DH-485 connections. So if you want to go online to a SLC5/03 using DH-485, use the UIC. Otherwise, if you are going online thru the serial port using DF1 protocol, you should use a computer with a serial port or a standard USB-serial adaptor and a modem (cross-over) cable.